Carbon Cycle

Combustion is another word for __________.

• Transportation
• Respiration
• Fossil Fuels
• Burning

Carbon can be found in...

• The atmosphere
• Soil
• Fossil fuels
• All of the above

Which of the following removes carbon from the atmosphere?

• Combustion
• Respiration
• Photosynthesis
• Death

Which of the following is true of the carbon cycle?

• Carbon sinks includes forests and oceans

• Carbon dioxide is released during photosynthesis

• Carbon dioxide in the air is reduced by cutting trees

• Carbon is concentrated in an igneous rock

Which process converts carbon in the form of sugar into carbon dioxide gas?

• Bioremediation
• Photosynthesis
• Respiration
• Transpiration

When humans burn fossil fuels, most of the carbon quickly enters the                       as carbon dioxide.

• Water
• Atmosphere
• Sun
• Air

How do living organisms return carbon to the atmosphere in the carbon cycle?

• respiration and photosynthesis
•  decomposition and respiration

How does the carbon in grass become part of a lion?

• The lion eats the grass
• Carbon from grass doesn't end up in a lion. 
• The carbon ends up in the lion's food chain. 
• The lion breathes in carbon given out by the plant

If the plant population decreased, the amount of carbon would _________.

• Stay the same
• Increase
• Decrease

How does carbon become locked inside the earth?

• Tree roots expel carbon into the soil as they grow.

• Humans use machines to pump carbon dioxide into large underground rocks.

• Rocks become richer in carbon as time goes by.

• The carbon-rich bodies of plants and animals decay into the earth after they die.